VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-53021: Linux kernel · scsi: target: core: Fix integer overflow in UNMAP bounds check

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d7aef29573c7c5cdb2dfad939253287a6329c2a4 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d7aef29573c7c5cdb2dfad939253287a6329c2a4, c08ab702c4699c6efb9d60bdb15b73e7a627ee7e, 02115986d027ade793e7f6be87e91d6a796d0aa3 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < d7aef29573c7c5cdb2dfad939253287a6329c2a4	Fixed in d7aef29573c7c5cdb2dfad939253287a6329c2a4
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < c08ab702c4699c6efb9d60bdb15b73e7a627ee7e	Fixed in c08ab702c4699c6efb9d60bdb15b73e7a627ee7e
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < 02115986d027ade793e7f6be87e91d6a796d0aa3	Fixed in 02115986d027ade793e7f6be87e91d6a796d0aa3
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < 51075df70c46e60a9773f2dcd28299e40dac36fb	Fixed in 51075df70c46e60a9773f2dcd28299e40dac36fb
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < 5efc3ef4758f8d98c257419fa21daca3227de61a	Fixed in 5efc3ef4758f8d98c257419fa21daca3227de61a
LinuxLinux	Affected ≥ 86d7182985d25900929adce14fffd729cc8c6fb8, < 3facdecc3fcf115cc4f9b3d8f118d6705e2456a8	Fixed in 3facdecc3fcf115cc4f9b3d8f118d6705e2456a8

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix integer overflow in UNMAP bounds check sbc_execute_unmap() checks LBA + range does not exceed the device capacity, but does not guard against LBA + range wrapping around on 64-bit overflow. Add an overflow check matching the pattern already used for WRITE_SAME in the same file.

References

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